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OddsRX

Free OddsRX tools

Understand the price.
Know the math.

Convert odds, compare value and explore stake sizes.
Seven calculators. No account required.

Odds & probability

Implied oddsTurn a price into its break-even probability and compare odds formats.No-vig oddsRemove the market overround from a two-outcome price and compare fair probabilities.Break-even priceStart with a win probability and find the fair price that breaks even.

Value & stake

Expected valueCompare your win-probability estimate with the offered price to calculate expected profit.Kelly stake sizingExplore how your estimated edge and a fractional Kelly setting affect stake size.

Parlays & hedging

Parlay payoutCombine leg prices to estimate the total return, net profit and implied probability.Hedge a positionCalculate the opposite-side stake that aims to equalize the two net outcomes.

Use the price and assumptions that apply to your bet. These tools explain the math; they do not predict results.